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Reports <code>if-then</code> expressions that can be folded into elvis (<code>?:</code>) expressions.
<p><b>Example:</b></p>
<pre><code>
  fun maybeFoo(): String? = "foo"

  var foo = maybeFoo()
  val bar = if (foo == null) "hello" else foo
</code></pre>
<p>The quick fix converts the <code>if-then</code> expression into an elvis (<code>?:</code>) expression:</p>
<pre><code>
  fun maybeFoo(): String? = "foo"

  var foo = maybeFoo()
  val bar = foo ?: "hello"
</code></pre>
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